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Fartlek Timer

Speed play with the planning done for you: after a five-minute warmup jog, the session rolls through surges, sprints, and easy stretches of varying lengths — a minute strong here, thirty seconds flat-out there, a couple of minutes easy to recover — before a three-minute cooldown jog, about 23:30 in all.

Fartlek is Swedish for “speed play,” and the varied intervals are the point: they train every gear and keep a run from feeling like a chore. Treat the easy stretches as genuine recovery and commit to the surges and sprints. Want a different mix? Open the preset in the editor and reshape any effort to suit the road in front of you.

Good to Know

Frequently Asked Questions

How long is the fartlek session?
About 23:30, including a five-minute warmup jog and a three-minute cooldown jog. The middle is a varied run of surges, sprints, and easy stretches rather than one repeated ratio.
How hard should the surges and sprints be?
Surges are strong but controlled — comfortably hard. Sprints are short enough to run fast and commit to. The easy stretches are true recovery, slow enough that the next effort starts in control.
Can I change the efforts?
Yes — fartlek is meant to be free-form. Open the preset in the editor and lengthen, shorten, or reorder any interval to match how you feel and the terrain you’re on.